So what is a click track exactly? It’s basically a single cowbell that goes to the beat of the song, so the extras can dance in rhythm.

Oh, and here’s another fun behind-the-scenes secret: While collabing with Ed Sheeran, Taylor didn’t even send HIM the track.

She wouldn’t ever send new songs, no. I hear them but it has to be with her. I remember when I did a song with her for her album, I was in San Francisco and they sent someone with a locked briefcase with an iPad and one song on it and they flew to San Francisco, and they played me the song I’ve done with her. And they were like, “Do you like it?” I was like, “Yeah.” And then they took it back. That’s how you hear them.

You can check out the full behind-the-scenes video for “End Game” here: